<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../vue.js/vue.js"></script>
</head>
<body>
    <div id="root">
        <h2>今天的天气很好{{info}}</h2>
        <button @click="changeWeather">点我切换天气</button>
    </div>
</body>
<script>
    const vm = new Vue({
        el:'#root',
        data:{
            isHot:true
        },
        computed:{
            info(){
                return this.isHot ? '炎热':'凉爽';
            }
        },
        methods: {
        changeWeather(){
            this.isHot = !this.isHot;
        }
        }
    })
</script>
</html>